there are more to healing spells than just healing wounds, like stamina recovery, buff, and can heal illness with specialist spells and mages(rare).
Some healing mages specialising in large scale spells are hired to cast spells on crops and fauna to increase yield and enhance the beauty of the garden. (latter is a privilege of super rich and first one is often done by governing Nobles for their fiefdom's crop)
Healing spell classification:-
MINOR GRADE
1st Class -No healing spell
2nd Class- can heal minor wounds
3rd Class- can heal simple soft tissue injury or simple ankle and wrist fractures and skull fracture with no brain damage.
(Willow can cast a rip-off of this spell yet it is as powerful as a normal 3rd class Minor Grade Spell)
MAJOR GRADE
1st Class- can heal Paralysis, Severe burns, Spinal injuries, Deep lacerations.
2nd Class- can heal amputation, spinal cord injuries, head and brain injuries and burns and scalds.
3rd class- can heal crush injuries that involve multiple broken bones and transection injury
SUPREME GRADE
No records, according to theory can heal anything as long as the wounded are 'alive'.